Ice core evidence for decoupling between midlatitude atmospheric water cycle and Greenland temperature during the last deglaciation
The last deglaciation represents the most recent example of natural global warming associated with large-scale climate changes. In addition to the long-term global temperature increase, the last deglaciation onset is punctuated by a sequence of abrupt changes in the Northern Hemisphere. Such interpl...
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fttriple:oai:gotriple.eu:6E4a1Ck6mhVT0zSWYZUqa 2023-05-15T13:36:52+02:00 Ice core evidence for decoupling between midlatitude atmospheric water cycle and Greenland temperature during the last deglaciation Landais, Amaëlle Capron, Emilie Masson-Delmotte, Valérie Toucanne, Samuel Rhodes, Rachael Popp, Trevor Vinther, Bo Minster, Bénédicte Prié, Frédéric 2019-01-25 https://doi.org/10.5194/cp-14-1405-2018 https://cp.copernicus.org/articles/14/1405/2018/ en eng Copernicus Publications doi:10.5194/cp-14-1405-2018 10670/1.l6cuv6 1814-9324 1814-9332 https://cp.copernicus.org/articles/14/1405/2018/ undefined Geographica Helvetica - geography eISSN: 1814-9332 envir geo Other https://vocabularies.coar-repositories.org/resource_types/c_1843/ Journal Article https://vocabularies.coar-repositories.org/resource_types/c_6501/ 2019 fttriple https://doi.org/10.5194/cp-14-1405-2018 2023-01-22T17:54:43Z The last deglaciation represents the most recent example of natural global warming associated with large-scale climate changes. In addition to the long-term global temperature increase, the last deglaciation onset is punctuated by a sequence of abrupt changes in the Northern Hemisphere. Such interplay between orbital- and millennial-scale variability is widely documented in paleoclimatic records but the underlying mechanisms are not fully understood. Limitations arise from the difficulty in constraining the sequence of events between external forcing, high- and low- latitude climate, and environmental changes. Greenland ice cores provide sub-decadal-scale records across the last deglaciation and contain fingerprints of climate variations occurring in different regions of the Northern Hemisphere. Here, we combine new ice d-excess and 17O-excess records, tracing changes in the midlatitudes, with ice δ18O records of polar climate. Within Heinrich Stadial 1, we demonstrate a decoupling between climatic conditions in Greenland and those of the lower latitudes. While Greenland temperature remains mostly stable from 17.5 to 14.7 ka, significant change in the midlatitudes of the northern Atlantic takes place at ∼16.2 ka, associated with warmer and wetter conditions of Greenland moisture sources. We show that this climate modification is coincident with abrupt changes in atmospheric CO2 and CH4 concentrations recorded in an Antarctic ice core. Our coherent ice core chronological framework and comparison with other paleoclimate records suggests a mechanism involving two-step freshwater fluxes in the North Atlantic associated with a southward shift of the Intertropical Convergence Zone. Article in Journal/Newspaper Antarc* Antarctic Greenland Greenland ice cores ice core North Atlantic Unknown Antarctic Greenland Climate of the Past 14 10 1405 1415 |
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envir geo Landais, Amaëlle Capron, Emilie Masson-Delmotte, Valérie Toucanne, Samuel Rhodes, Rachael Popp, Trevor Vinther, Bo Minster, Bénédicte Prié, Frédéric Ice core evidence for decoupling between midlatitude atmospheric water cycle and Greenland temperature during the last deglaciation |
topic_facet |
envir geo |
description |
The last deglaciation represents the most recent example of natural global warming associated with large-scale climate changes. In addition to the long-term global temperature increase, the last deglaciation onset is punctuated by a sequence of abrupt changes in the Northern Hemisphere. Such interplay between orbital- and millennial-scale variability is widely documented in paleoclimatic records but the underlying mechanisms are not fully understood. Limitations arise from the difficulty in constraining the sequence of events between external forcing, high- and low- latitude climate, and environmental changes. Greenland ice cores provide sub-decadal-scale records across the last deglaciation and contain fingerprints of climate variations occurring in different regions of the Northern Hemisphere. Here, we combine new ice d-excess and 17O-excess records, tracing changes in the midlatitudes, with ice δ18O records of polar climate. Within Heinrich Stadial 1, we demonstrate a decoupling between climatic conditions in Greenland and those of the lower latitudes. While Greenland temperature remains mostly stable from 17.5 to 14.7 ka, significant change in the midlatitudes of the northern Atlantic takes place at ∼16.2 ka, associated with warmer and wetter conditions of Greenland moisture sources. We show that this climate modification is coincident with abrupt changes in atmospheric CO2 and CH4 concentrations recorded in an Antarctic ice core. Our coherent ice core chronological framework and comparison with other paleoclimate records suggests a mechanism involving two-step freshwater fluxes in the North Atlantic associated with a southward shift of the Intertropical Convergence Zone. |
format |
Article in Journal/Newspaper |
author |
Landais, Amaëlle Capron, Emilie Masson-Delmotte, Valérie Toucanne, Samuel Rhodes, Rachael Popp, Trevor Vinther, Bo Minster, Bénédicte Prié, Frédéric |
author_facet |
Landais, Amaëlle Capron, Emilie Masson-Delmotte, Valérie Toucanne, Samuel Rhodes, Rachael Popp, Trevor Vinther, Bo Minster, Bénédicte Prié, Frédéric |
author_sort |
Landais, Amaëlle |
title |
Ice core evidence for decoupling between midlatitude atmospheric water cycle and Greenland temperature during the last deglaciation |
title_short |
Ice core evidence for decoupling between midlatitude atmospheric water cycle and Greenland temperature during the last deglaciation |
title_full |
Ice core evidence for decoupling between midlatitude atmospheric water cycle and Greenland temperature during the last deglaciation |
title_fullStr |
Ice core evidence for decoupling between midlatitude atmospheric water cycle and Greenland temperature during the last deglaciation |
title_full_unstemmed |
Ice core evidence for decoupling between midlatitude atmospheric water cycle and Greenland temperature during the last deglaciation |
title_sort |
ice core evidence for decoupling between midlatitude atmospheric water cycle and greenland temperature during the last deglaciation |
publisher |
Copernicus Publications |
publishDate |
2019 |
url |
https://doi.org/10.5194/cp-14-1405-2018 https://cp.copernicus.org/articles/14/1405/2018/ |
geographic |
Antarctic Greenland |
geographic_facet |
Antarctic Greenland |
genre |
Antarc* Antarctic Greenland Greenland ice cores ice core North Atlantic |
genre_facet |
Antarc* Antarctic Greenland Greenland ice cores ice core North Atlantic |
op_source |
Geographica Helvetica - geography eISSN: 1814-9332 |
op_relation |
doi:10.5194/cp-14-1405-2018 10670/1.l6cuv6 1814-9324 1814-9332 https://cp.copernicus.org/articles/14/1405/2018/ |
op_rights |
undefined |
op_doi |
https://doi.org/10.5194/cp-14-1405-2018 |
container_title |
Climate of the Past |
container_volume |
14 |
container_issue |
10 |
container_start_page |
1405 |
op_container_end_page |
1415 |
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1766085177369427968 |